3RU11热过载继电器额定电流可达 100A。它被设计用来为具有一般起动条件 （见“脱扣等级”）的用电设备提供与电流有关的保护，以防止其温升因过载或缺相（见“缺相保护”） 而超出允许值。过载或缺相会导致电动机的电流升高超过整定的额定电流值 （见“整定”）。电流的升高通过发热元件加热过载继电器内的双金属条，后者弯曲后又通过一个脱扣机构来操作一副辅助触头 （见 “辅助触头”）。此辅助触头又可通过一个接触器来断开负载。断开时间取决于脱扣电流与额定工作电流I e之比值具有长期稳定的脱扣特性曲线 （见“脱扣特性”）。 “脱扣”状态由一个通断位置指示器来指示 （见“状态指示”）。在一段恢复时间 （见“恢复时间”）过后，继电器可以手动或自动复位 （见“手动和自动复位”）。
3RU11热过载继电器专门针对3RT1 接触器进行了电气和机械方面的优化。除可独立安装外，还可以直接插接在接触器上以节省空间 （见“设计与安装”）。主、 辅回路可以多种方式连接 （见“连接”），包括使用笼形卡头式端子。过载继电器连好后，可以通过一个测试检验其动作是否正常 （见“测试功能”）。 除了测试功能以外，3RU11热过载继电器还配有停止功能 （见 “停止功能”）。
3RU11热过载继电器用途很广，详情请参考下列章节“应用” 、 “环境条件” 、 “用于星型-三角形组合的过载继电器”和“与变频器配合使用” 3RU11 热过载继电器只提供过载和缺相保护。用户仍须采用熔丝或断路器进行短路保护（见 “短路保护”）。3RU11热过载继电器是环保型产品 （见“环保考虑” ）。它符合所有主要的国际标准和认证 （见 “规
格”和“EEx 增强型安全保护”）。3RU11热过载继电器的附件是按照“用最少的种类以满足所有的要求”这一原则进行设计的。
应用
3RU11热过载继电器适用于保护三相及单相交流及直流电机。
如果单相交流或直流负载要采用3RU11热过载继电器加以保护，则所有三相双金属片都必须加热。因此继电器的所有主电路都必须串联。

与星—三角起动器组合的过载继电器
当在星形 — 三角形组合中采用过载继电器时，必须注意只有1/U的电机电流流过主接触器。安装在主接触器上的过载继电器必须设置为电机电流的0.58 倍。3RU2116-1DB1

厦门彬硕自动化科技有限公司  欧阳先生

固话：0592-5588182
手机：18050007615
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